Method of making secondary racks



Oct. 28, 1930. c. l.. PEIRCE, JR

METHOD OF MAKING SECONDARY RACKS Filed May 4, 1929 :lllllIwllml| -rl Q .M MMT@ n I V Y l |715 i l I CJVEN'ToR l I Patented Oct. 28, 1930 UNITED STATES PATENT OFFICE CHARLES L. PEIBCE, JR., OF YITTSBUBGH, PENNSYLVANIA, ASSIGNOR 0F ONE-HALF TO HUBBABD AND COMPANY, A CORPORATION 0F PENNSYLVANIA METHOD 0F MAKING SECONDARY RACES Application led Hay 4, 1929. Serial No. 360,423.

This invention relates to the method of manufacturing insulator supports and more particularly to the method of manufacturlng insulator supports of the type knownas secondary racks such as are commonly employed for supporting a number of electric wires on an associated pole, wall or thelike.

An object of the present' invention is to provide an improved method of manufacturing secondary racks of the type set forth.

A further object is to provide an improved method of manufacturing a device of the type set forth from stock metal without waste of metal.

A still further object is to provide a method of manufacturing secondary insulator racks which consists in rolling a blank from stock metal andin stamping the completed rack from the blank.

These and other objects which will be apparent to those skilled in th1s particular` art are attained by means of the invention illustrated in the accompanying drawings. in which Figure 1 is a view in elevation of a blank formed during the process of manufacturing insulator racks in accordance wlth one embodiment of this invention. Fig. 2 1s an end view of the blank shown in Fig'. 1. Fig. 3 is a view similar to Fig. 1 showing the finished rack and Fig. 4 is a side elevation of the rack shown in Fig. 3. Fig. 5 is a partial view in elevation of a modlficatlon.

In the particular embodiment of th1s 1nvention which has been c hosen for the purposes of illustration a piece of metal stock is forged, by drop forging or rolling, to form a blank of elongated form and of irregular cross section as shown in Figs. l and 2. As illustrated, the shape to which the metal stock is forged is elongated and of lrregular cross section so as to provide a blank havlng longitudinally extending, spaced s1de flanges 5 along each side thereof and these flanges are connected by a central web portion 6 joined to the inner edge of each flange by forwardly extending legs 7. The central web 61s provided at spaced intervals with thickened portions or cross members 8 extending across the web and joining the forwardly projecting legs 7, each cross member being nearly equal in thickness to the depth of such legs, see Fig. 2. The central web is also provided with longitudinally extending thickened portions 9 extendin downwardly from each thickened cross mem er 8 and terminating in a rounded boss 10 which is formed in the web 6 just above the next cross member 8.

The blank so formed is then subjected to cutting and bending operations in which the elongated thickened portions 9 and bosses 10 are severed from the metal of the web 6 and bent upwardly to the positions shown in Figs. 3 and 4 wherein they extend outwardly from the cross members 8 to form insulator supporting arms 11 having perforated insulator supporting bosses 12 `for supporting the spool type insulators threaded on the usual pin 13 in the usual manner. Perforations 15 can be formed in the base flanges 5 either during the forging or subsequent operations and such perforations may be used for coo erating with the usual supporting bolts. t will be apparent that a secondary rack of extremely rugged, and at the same time, simple construction is provided and that it is formed by a relatively few steps of standard metal working operations.

The finished rack includes a base formed by the spaced base members or outwardly extending flanges 5 which are connected with the forwardly projecting legs by the central cross members 8. The severing of the elongated arms from the central portion of the web andthe bending of the arms upwardly provides the web with elongated openings 16 flanked by web portions 17 which are capable of cooperatlng with the usual through bolts commonly employed for supporting secondary racks, and are also especially adapted for use with the form of fastening described and claimed in my co-pending application Serial No. 564,275, filed May 27, 1922. The supporting parts which are subjected to the greatest strain are the heavy thickened cross members 8 and the integral, outwardly extending insulator suporting arms 11 which are formed integra ly with the thickened cross members 8.

It will be apparent that the blank can be so formed, if desired, that the insulator supporting arms 11 are connected to and extend outwardly from the front face of the thickened cross members 8, as shown in Fig. 5, instead of from the bottom thereof. Such an arrangement will provide a slightly greater reach of insulator supporting arm.

Although I have described in detail a specie form of this invention together with a particular series of specific steps for manufacturing the same, it will be apparent that various changes, additions,- omissions' and,

substitutions can be made therein without departing from the spirit of the invention or the scope ofthe appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. The method of making insulator supporting structures which consists in forging metal stock to form an elongated blank having a cross section of varying thickness and subsequently lforming outwardly extending insulator supporting arms from the thickened portions of the blank.

2. The method of making insulator supporting structures which consists in rolling metal stock to form a blank of channel form provided with outwardl extending side flanges and a central web aving a cross section of varying thickness, partially severing the thickened portions from the web and bendingsaid severed portions outwardly to form insulator supporting arms.

3. The method of making insulator supporting structures which consists in forging a piece of metal to form an elongated blank having spaced base members andD a connecting web'of varying cross section, partiall severing the thickened portions from the we and bending said severed portions outwardly to form insulator supporting arms.

4.'The method of making insulator supporting structures which consists in forging a piece of metal to form an elongated blank having side members connected by a central web provided vwith spaced cross members of substantially greater thickness than the metal of said web and elongated portions extending longitudinally of said web between said thickened cross members, severing said elongated portions from said web and bending said severed portions so as to extend outwardly from said cross members to form insulator supporting arms.

5. The method of making insulator supporting structures which consists in forging metal stock to form an elongated blank having spaced side members connected by an integral offset web having portions extendin thereacross between said side flanges of su' stantially greater. thickness than the metal of said web and connected to similarly thick-` ened portions of less width than said web extending longitudinally of said web, said elongated portions terminating in a perforated boss, severing said elongated portions and said boss from the metal of said web and bending said severed portions upwardly so as' to provide a secondary rack having spaced base members connected by comparatively heavy integral cross members supporting outwardly extending integral insulator supportlng arms.v

6. The method of manufacturing insulator supporting structures whichconsists in rolling from stock metal an elongated lblank having longitudinall extending side members connected by a we having cross members and longitudinal portions extending therefrom of greater thickness than said web, in severing the longitudinally extended portion of said cross member from said web and in bending outwardly said longitudinal portion from said web `for forming insulator support arms for said structure.

7. The method of `making insulator sup-k porting structures which consists in rolling a piece of metal to form an elongated blank having spaced base members and a connecting web of varying cross section, partially severing the thickened portions from the web and bending said severedl portions outwardly to form insulator supporting arms.

v8. The method of making insulator supporting structures which consists in rolling metal stock to form an elongated blank havin a cross section of varying thickness and su sequently forming outwardly extending insulator supporting arms from the thickened portions of the blank.

In testimony whereof, I have hereunto sub- 1 scribed my name this 27 th day of Apr1l,1929. nu

CHARLES L. PEIRCE, JR. 

